John hofman



(No Model.)

J. HOFMAN.

SASH FASTENER.

No. 355,450. Patented Jan. 4, 1887.

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NITED STATES PATENT OFFicEI.

JOHN HOFMAN, OF. ROCHESTER, NEW YORK.

SASHFASTENER.

SPECIFICATION forming part of Letters Patent No. 355,456, dated January 4, 1887.

Application filedOctobcr 20, 1886. Serial No. 216,702. (No model.) I

first, a simple and cheap lock which is applicable to a sash, door, or 'the like, to hold the same open or shut at will; second, a lock in which the pressure on the thumb-piece ex erted to'unfasten the lock tends at the same time to move the sash or door in the direction of the pressure; third, a lock which may be fastened shut by means independent of a spring.

My lock is particularly applicable to the doors of showcases, to the sashes of car-windows, and the like, which open and shut by sliding vertically in grooves, and which must be held open or shut, as desired.

The accompanying drawings, which form part of this specification, show my invention in detail.-

Figure 1 is a view of my lock when lastened shut and the cover-plate is removed. Fig. 2 is a'view showing parts alter their movement.

Similar letters indicate similar parts.

In both figures, A A is the actuating-lever and thumb-piece.

B B are the locking arms or catches.

G is a spring holding the catches in a posi tion to catch automatically.

D is the locking-cam. E is the case of the lock. a a are pins formed upon the actuating-lever,

which operate the locking arms or catches B B.

-ing-cam D is independent of said spring.

f is the pin or hearing or trunnion on which the locking-cam turns. The operation of my device is as follows: The locking-cam is first turned by any suitable means from the position as shown in Fig.

1 to the position as shown in-Fig. 2. When i then depressed until the arm of the catch B strikesthe post d, when further pressure on the thumb-piece will cause the door, sash, or the like to which the lock is fastened to move in the direction of the pressure. The motion may be continued until the catch B engages its plate, is thrown back, and fastens itself automatically by the pressure of the spring 0. When the pressure is removed from the thumbpiece, the spring 0 causes the several parts to take the positions as in Fig. 1; but the lock- As the device is symmetrical with reference to a plane passed through the actuating-lever, the raising of the thumb-piece'will cause the catch B to disengage itself from its plate, and the door or sash may be opened, the parts having movements similar to those just described.

In order to lock a door or sash shut, I'have provided the locking-cam D, which may turn on trunnions projecting through the case and cover, or on a pin, and may be actuated by any suitable means. When it is turned to the position shown in Fig. 1, it is impossible to depress the thumb-piece and to move the catch B.

I claim In a lock of the class described, the combination of the case E, the rectangular locking arms or catches B B, pivoted at b b, the actu ating-lever A A, pivoted ate and provided with the pins a a, the spring 0, and the post or stop (I, substantially as and for the purposes described.

JOHN HOFMAN.

- Witnesses: VVILLIAM B. LEE, RH. LANSING. 

